luke 17:24 For as the lightning, that lighteneth out of the one part under heaven, shineth unto the other part under heaven; so shall also the Son of man be in his day. - Free Bible Online

      24. as lightning . . . so . . . the Son of man--that is it will be as manifest. The Lord speaks here of His coming and manifestation in a prophetically indefinite manner, and in these preparatory words blends into one the distinctive epochs [STIER]. When the whole polity of the Jews, civil and ecclesiastical alike, was broken up at once, and its continuance rendered impossible by the destruction of Jerusalem, it became as manifest to all as the lightning of heaven that the kingdom of God had ceased to exist in its old, and had entered on a new and perfectly different form. So it may be again, ere its final and greatest change at the personal coming of Christ, and of which the words in their highest sense are alone true.

JFB.